What does the LCAC primarily transport from ship to shore?

The correct choice highlights the primary function of the Landing Craft Air Cushion (LCAC), which is specifically designed to transport weapon systems, cargo, and personnel from ships to the shore. The LCAC's unique air-cushion technology allows it to navigate over a variety of terrain, making it highly versatile for amphibious operations.

This capability is critical in military operations where rapid and efficient movement of troops and equipment is necessary to maintain operational tempo, especially during assaults on hostile shores. The LCAC can carry a substantial load, enabling it to deliver not just personnel but also vital military assets like vehicles, artillery, and supplies directly onto the beach, facilitating quick deployment and support for ground forces.

While other options like fuel, medical supplies, and construction materials are important in a broader supply chain, they do not capture the comprehensive transport role of the LCAC in military operations. This craft is not limited to these other categories, as its primary mission is to support the direct transfer of military forces and equipment critical for establishing a foothold on enemy territory.